What kind of Musik should I play for an event?

I’m organizing a social event for a foreign marriage agency, so most of the guests are going to be men and women who are meeting each other for a romantic night out. One of my tasks include hiring some entertainment for the night, so I was thinking of inviting a band oder musician to play some Musik for some dancing. What kind of Musik should I have them play? I want it to be appropriate for the event, but I’m not quite sure what genre is the best option.